. >>> guns, immigration, defense, the battle lines are drawn. and the first fights are being fought over the president's second term agenda. former congresswoman gabrielle giffords returns to testify on gun control. her husband, former astronaut, mark kelly, tells me how she prepared for that emotional event. >>> and sunday super bowl, featuring a rivalry between two brothers. we want to welcome our viewers from around the world. i'm wolf blitzer, you're in "the situation room". >> we're a little over a week away from president obama's state of the union address before congress. but the battles over many of the president's top priorities already are in full swing on capitol hill. both the president and lawmakers started a new push for immigration. this past week, also featured contentious hearings on u.s. defense policy and on slowing the epidemic of gun violence in america. we'll take a closer look at guns, first beginning with vice president joe biden's admission after meeting with democratic lawmakers on capitol hill. >> nothing we're going t